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?? 基于AD公司的blackfin系列芯片的最小系統設計
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%;
  word-break:break-all'><span style='font-size:9.0pt;line-height:150%'>基于<span
  lang=EN-US>ADSP-BF533</span>的最小系統設計<span lang=EN-US><o:p></o:p></span></span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%;
  word-break:break-all'><span style='font-size:9.0pt;line-height:150%'>作者：趙博，閆…<span
  lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;</span>文章來源：《現代電子技術》<span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;</span>點擊數：<span
  lang=EN-US><script language="JavaScript"  src="/Article/GetHits.asp?ArticleID=15607">
  </script>&nbsp;&nbsp;&nbsp;&nbsp;</span>更新時間：<st1:chsdate IsROCDate="False"
  IsLunarDate="False" Day="23" Month="8" Year="2007" w:st="on"><span
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  <p class=MsoNormal align=center style='text-align:center;word-break:break-all'><span
  style='font-size:9.0pt'>趙博，閆達遠，張 棟，馬思博，周 雅<span lang=EN-US>(</span>北京理工大學信息科學技術學院北京<span
  lang=EN-US> 100081)<o:p></o:p></span></span></p>
  <p class=MsoNormal align=center style='text-align:center;word-break:break-all'><span
  lang=EN-US style='font-size:9.0pt'>&nbsp;<o:p></o:p></span></p>
  <div align=center>
  <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
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    <td style='padding:0cm 0cm 0cm 0cm'>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>l </span><span style='font-size:9.0pt;line-height:150%'>引
    言<span lang=EN-US><br>
    <br>
    ADSP-BF533</span>處理器是<span lang=EN-US>Blackfin</span>系列產品的成員，專為滿足當今嵌入式音頻、視頻和通信應用的計算要求和低功耗條件而設計的新型<span
    lang=EN-US>16</span>位嵌入式處理器。他基于由<span lang=EN-US>ADI</span>和<span
    lang=EN-US>Intel</span>公司聯合開發的微信號架構<span lang=EN-US>(Micro
    SignalArchitecture,MSA)</span>，將一個<span lang=EN-US>32</span>位<span
    lang=EN-US>RISC</span>型指令集和雙<span lang=EN-US>16</span>位乘法累加<span
    lang=EN-US>(MAC)</span>信號處理功能與通用型微控制器所具有的易用性組合在了一起。<span lang=EN-US>ADSP-BF533</span>處理器具有以下主要特點：<span
    lang=EN-US><br>
    <br>
    (1)</span>最大頻率為<span lang=EN-US>600 MHz</span>，<span lang=EN-US>1 200 MMACs</span>；<span
    lang=EN-US><br>
    <br>
    (2)</span>每一個內核中帶有<span lang=EN-US>2</span>個<span lang=EN-US>16</span>位的乘法器，<span
    lang=EN-US>2</span>個<span lang=EN-US>40</span>位的累加器，<span lang=EN-US>2</span>個<span
    lang=EN-US>40</span>位的邏輯運算單元，<span lang=EN-US>4</span>個位的視頻運算單元和<span
    lang=EN-US>1</span>個<span lang=EN-US>40</span>位的移位器。在一個指令周期內可完成<span
    lang=EN-US>2</span>個<span lang=EN-US>16</span>位數的乘法，<span lang=EN-US>2</span>個<span
    lang=EN-US>40</span>位數的算術邏輯運算，<span lang=EN-US>4</span>個位的視頻數據算術邏輯運算，<span
    lang=EN-US>1</span>個<span lang=EN-US>40</span>位的移位運算；<span lang=EN-US><br>
    <br>
    (3)</span>低功耗，采用<span lang=EN-US>1</span>．<span lang=EN-US>2 V</span>的內核電壓和<span
    lang=EN-US>3</span>．<span lang=EN-US>3 V</span>的<span lang=EN-US>I/O</span>電壓，片內集成調壓器，并且具備動態電源管理；<span
    lang=EN-US><br>
    <br>
    (4)</span>高達<span lang=EN-US>148 kB</span>的片內存儲器；<span lang=EN-US><br>
    <br>
    (5)</span>豐富的外設接口，支持與<span lang=EN-US>SDRAM</span>，<span lang=EN-US>SRAM</span>，<span
    lang=EN-US>FLASH</span>和<span lang=EN-US>ROM</span>的無縫連接；<span lang=EN-US><br>
    <br>
    (6)</span>片上<span lang=EN-US>JTAG</span>仿真接口。<span lang=EN-US><o:p></o:p></span></span></p>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>系統總體設計<span
    lang=EN-US><br>
    <br>
    </span>最小系統是由保證處理器可靠工作所必須的基本電路組成的<span lang=EN-US>,</span>主要包括電源電路、時鐘電路、復位電路、<span
    lang=EN-US>SDRAM</span>、<span lang=EN-US>FLASH</span>存儲器和<span lang=EN-US>JTAG</span>接口電路組成，其硬件框圖如圖<span
    lang=EN-US>1</span>所示。<span lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
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      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=269 height=168 id="_x0000_i1038"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093805211.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>．<span
    lang=EN-US>1 </span>電源電路<span lang=EN-US><o:p></o:p></span></span></p>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>BF-533</span><span style='font-size:9.0pt;line-height:
    150%'>外部<span lang=EN-US>IO</span>供電電壓為<span lang=EN-US>3</span>．<span
    lang=EN-US>3 V</span>，內核供電電壓為<span lang=EN-US>1</span>．<span lang=EN-US>2 V</span>。因此，最小系統采用雙電源輸出方案，采用<span
    lang=EN-US>TPS73HD301</span>作為電源芯片，典型輸入電壓為<span lang=EN-US>+5 V</span>，輸出電壓為<span
    lang=EN-US>+3</span>．<span lang=EN-US>3 V</span>和<span lang=EN-US>+1</span>．<span
    lang=EN-US>2 V</span>，每個輸出最大可提供<span lang=EN-US>750 mA</span>的電流。<span
    lang=EN-US>TPS73HD301</span>具有電壓監控功能，以保證被供電芯片在一個恒壓下正常工作。他為每一路電壓輸出提供一個復位輸出口，當他檢測到輸出的電壓為欠壓狀態時，與那個輸出電壓相對應的<span
    lang=EN-US>RESET</span>管腳將輸出一個低電平，以啟動系統復位。其電路如圖<span lang=EN-US>2</span>所示。<span
    lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes'>
      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=270 height=179 id="_x0000_i1039"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093806844.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>．<span
    lang=EN-US>2 </span>時鐘電路<span lang=EN-US><br>
    <br>
    BF-533</span>可以使用外部時鐘，也可以使用內部振蕩電路。當使用外部時鐘時，應將此外部時鐘連接到<span lang=EN-US>DSP</span>的<span
    lang=EN-US>CLKIN</span>引腳，且<span lang=EN-US>XTAL</span>引腳懸空。本系統采用的是內部振蕩電路外接晶振的方式，晶振連接到<span
    lang=EN-US>CLKIN</span>和<span lang=EN-US>XTAL</span>之間，并與兩個電容相連，如圖<span
    lang=EN-US>3</span>所示。<span lang=EN-US><br>
    <br>
    2</span>．<span lang=EN-US>3 </span>復位電路<span lang=EN-US><br>
    <br>
    </span>手動復位是最小系統常用的功能，本系統采用專用復位芯片<span lang=EN-US>IMP811</span>實現手動復位，如圖<span
    lang=EN-US>3</span>所示。<span lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes'>
      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=264 height=139 id="_x0000_i1040"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807115.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>．<span
    lang=EN-US>4 JTAG</span>接口電路<span lang=EN-US><br>
    <br>
    BF-533</span>提供了一個<span lang=EN-US>1EEE 11 49</span>．<span lang=EN-US>1
    JTAG</span>測試訪問端口。通過此端口，仿真器能夠訪問<span lang=EN-US>DSP</span>的內部，允許開發者裝載代碼，設置斷點，觀察變量和寄存器。本系統采用<span
    lang=EN-US>14</span>針接口的標準，如圖<span lang=EN-US>4</span>所示。<span lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes'>
      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=210 height=185 id="_x0000_i1041"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807446.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>．<span
    lang=EN-US>5 SDRAM<br>
    <br>
    SDRAM(</span>同步動態隨機存儲器<span lang=EN-US>)</span>具有隨機讀寫速度快，寫入數據之前不需要進行擦除的特點，在嵌入式系統中成為不可缺少的存儲設備之一。本系統采用<span
    lang=EN-US>HY57V561620</span>，其容量為<span lang=EN-US>32 MB</span>，最高頻率為<span
    lang=EN-US>133 MHz</span>。<span lang=EN-US>ADSP-BF533</span>支持與<span
    lang=EN-US>SDRAM</span>的無縫連接，<span lang=EN-US>SDRAM</span>的地址映射為<span
    lang=EN-US>OX00000000</span>～<span lang=EN-US>OX080000000</span>，其連接方法如圖<span
    lang=EN-US>5</span>所示。<span lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes'>
      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=229 height=202 id="_x0000_i1042"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807561.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p style='line-height:150%'><span style='font-size:9.0pt;line-height:150%'>對于<span
    lang=EN-US>SDRAM</span>可以采用以下程序進行測試： <span lang=EN-US><o:p></o:p></span></span></p>
    <p class=MsoNormal style='line-height:150%'><span lang=EN-US
    style='font-size:9.0pt;line-height:150%'><img border=0 width=350
    height=360 id="_x0000_i1043"
    src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807717.jpg"><br>
    </span><span style='font-size:9.0pt;line-height:150%'>該程序將<span lang=EN-US>0x2000000</span>個數寫入<span
    lang=EN-US>SDRAM</span>，在<span lang=EN-US>Visual DSP++</span>的<span
    lang=EN-US>BLACKFIN Memory</span>窗口可以觀察到<span lang=EN-US>SDRAM</span>的數據寫入情況，以驗證寫入是否正確。
    <span lang=EN-US><o:p></o:p></span></span></p>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>2</span><span style='font-size:9.0pt;line-height:150%'>．<span
    lang=EN-US>6 FLASH</span>存儲器<span lang=EN-US><br>
    <br>
    ADSP-BF533</span>具有<span lang=EN-US>3</span>種引導模式，如表<span lang=EN-US>1</span>所示。當上電復位或者軟件初始化復位后，處理器采樣復位配置寄存器<span
    lang=EN-US>BMODE</span>引腳，執行引導功能。無論采取何種引導模式，都要從外部存儲器設備首先讀取一個<span
    lang=EN-US>10</span>個字節的頭。這個頭指定將被傳輸的字節數量和存儲器的目的地址。多存儲器模塊可被任何引導次序裝載，一但所有模塊被裝載，程序從<span
    lang=EN-US>L1</span>指令<span lang=EN-US>SRAM</span>的起始部分開始執行指令。<span
    lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes'>
      <td style='padding:0cm 0cm 0cm 0cm'>
      <p class=MsoNormal align=center style='text-align:center;line-height:
      150%'><span lang=EN-US style='font-size:9.0pt;line-height:150%'><img
      border=0 width=292 height=176 id="_x0000_i1044"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807513.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
    line-height:150%'>本系統采用<span lang=EN-US>NOR FLASH</span>作為引導代碼存儲器，選用容量為<span
    lang=EN-US>1 MB</span>的<span lang=EN-US>AM29LV800D</span>，將其接在<span
    lang=EN-US>BF-533</span>異步存儲空間的<span lang=EN-US>BANK0</span>上，其地址范圍為<span
    lang=EN-US>0x20000000</span>～<span lang=EN-US>0x20100000</span>，電路如圖<span
    lang=EN-US>6</span>所示。<span lang=EN-US><o:p></o:p></span></span></p>
    <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=675
     style='width:506.25pt;mso-cellspacing:0cm;mso-padding-alt:0cm 0cm 0cm 0cm'>
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes;
      height:8.25pt'>
      <td style='padding:0cm 0cm 0cm 0cm;height:8.25pt'>
      <p class=MsoNormal align=center style='text-align:center;mso-line-height-alt:
      8.25pt'><span lang=EN-US style='font-size:9.0pt'><img border=0 width=229
      height=181 id="_x0000_i1045"
      src="http://www.61ic.com/Article/UploadFiles/200708/20070823093807168.jpg"><o:p></o:p></span></p>
      </td>
     </tr>
    </table>
    <p class=MsoNormal style='line-height:150%'><span lang=EN-US
    style='font-size:9.0pt;line-height:150%'>3</span><span style='font-size:
    9.0pt;line-height:150%'>系統設計注意事項<span lang=EN-US><br>
    <br>
    (1)</span>對于沒有用到的<span lang=EN-US>DSP</span>引腳，應將其拉高、拉低，或者定義成輸出端，例如如果<span
    lang=EN-US>nBR</span>，<span lang=EN-US>ARDY</span>引腳不用時應拉高，<span
    lang=EN-US>RTXI</span>，<span lang=EN-US>NMI</span>引腳不用時應拉低。<span
    lang=EN-US><br>
    <br>
    (2)</span>在電路板設計中，應在電源和地之間合理分布去耦電容，以濾除噪聲，提高系統的穩定性。<span lang=EN-US><br>
    <br>
    (3)</span>盡量縮短高頻信號的走線，時鐘和負載的連線盡量短而粗，并且晶振下面不要走線。 <span lang=EN-US><o:p></o:p></span></span></p>
    <p style='line-height:150%'><span lang=EN-US style='font-size:9.0pt;
    line-height:150%'>4 </span><span style='font-size:9.0pt;line-height:150%'>結
    語<span lang=EN-US><br>
    <br>
    </span>最小系統可以直接作為核心部件應用與工程和科研中，具有良好的通用性和可擴展性。在最小系統的基礎上，可以很方便地進行二次開發和功能擴展，能夠縮短開發周期，降低開發成本。本文實現了最小系統的基本功能，介紹了各模塊的硬件電路，為<span
    lang=EN-US>DSP</span>應用技術的研究提供了一個良好的平臺。<span lang=EN-US><o:p></o:p></span></span></p>
    <p class=MsoNormal style='line-height:150%'><span lang=EN-US
    style='font-size:9.0pt;line-height:150%'><o:p>&nbsp;</o:p></span></p>
    </td>
   </tr>
   <tr style='mso-yfti-irow:1'>
    <td style='padding:0cm 0cm 0cm 0cm'>
    <p class=MsoNormal style='line-height:150%'><span lang=EN-US
    style='font-size:9.0pt;line-height:150%'>&nbsp;<o:p></o:p></span></p>
    </td>
   </tr>
   <tr style='mso-yfti-irow:2;mso-yfti-lastrow:yes'>
    <td style='padding:0cm 0cm 0cm 0cm'>
    <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
    style='font-size:9.0pt;line-height:150%'>本文摘自《現代電子技術》<span lang=EN-US><o:p></o:p></span></span></p>
    </td>
   </tr>
  </table>
  </div>
  <p class=MsoNormal align=center style='text-align:center;word-break:break-all'><span
  lang=EN-US style='font-size:9.0pt'><o:p></o:p></span></p>
  </td>
 </tr>
</table>

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